US11759869B2 - Cutting insert for drilling - Google Patents

Cutting insert for drilling Download PDF

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Publication number
US11759869B2
US11759869B2 US16/632,558 US201816632558A US11759869B2 US 11759869 B2 US11759869 B2 US 11759869B2 US 201816632558 A US201816632558 A US 201816632558A US 11759869 B2 US11759869 B2 US 11759869B2
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Prior art keywords
cutting edge
ridge
insert
cutting
extension portion
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US16/632,558
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US20200238397A1 (en
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Kee Young No
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Taegutec Ltd
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Taegutec Ltd
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Assigned to TAEGUTEC, LTD. reassignment TAEGUTEC, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NO, KEE YOUNG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/02—Twist drills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B23B27/141—Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness
    • B23B27/143—Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness characterised by having chip-breakers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/04—Overall shape
    • B23B2200/0404—Hexagonal
    • B23B2200/0419—Hexagonal trigonal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/04—Overall shape
    • B23B2200/0447—Parallelogram
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/04—Overall shape
    • B23B2200/0471—Square
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/04—Overall shape
    • B23B2200/049—Triangular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/08—Rake or top surfaces
    • B23B2200/081—Rake or top surfaces with projections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/24—Cross section of the cutting edge
    • B23B2200/242—Cross section of the cutting edge bevelled or chamfered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/32—Chip breaking or chip evacuation
    • B23B2200/321—Chip breaking or chip evacuation by chip breaking projections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/32—Chip breaking or chip evacuation
    • B23B2200/328—Details of chip evacuation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/36—Other features of cutting inserts not covered by B23B2200/04 - B23B2200/32
    • B23B2200/3618—Fixation holes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/50—Drilling tools comprising cutting inserts

Definitions

  • the present invention relates to a cutting insert for drilling, and more particularly to a shape of a cutting insert for drilling capable of performing chip control more efficiently in processing of a difficult-to-cut material such as stainless steel (SUS) and mild steel, and hole making.
  • a difficult-to-cut material such as stainless steel (SUS) and mild steel, and hole making.
  • a drilling tool which has a drill body on which a plurality of interchangeable cutting inserts for drilling are mounted and which is rotatable about a longitudinal axis for drilling into a solid metal material.
  • the cutting insert for drilling has a symmetrical shape and is indexable such that a plurality of edges can be sequentially used.
  • WO 03/099494 A1 discloses a drilling tool comprising a main body and two cutting inserts, wherein one cutting insert forms a central insert and the other cutting insert forms an edge insert.
  • An active cutting edge of each of the central insert and the edge insert in use protrudes axially beyond the main body, which allows a chip to be removed from a workpiece when the drilling tool is actuated.
  • a cutting edge 12 is formed along the edge of the upper surface of the cutting insert 10 for drilling.
  • a chip former 15 disposed corresponding to the cutting edge 12 is provided between the cutting edge 12 and a central hole 14 for control (chip control) of a chip C generated from the workpiece to be drilled.
  • the chip former is a region which is formed in four directions along the cutting edge 12 and substantially lower than a upper surface 16 .
  • the chip control performance may vary depending on the hardness of the workpiece, a width W 1 of the chip former 15 and the like.
  • a workpiece to be processed by the cutting insert 10 for drilling is made of a material such as mild steel or stainless steel or a hole making process is performed by the cutting insert 10 for drilling, it can generally be seen as a difficult-to-cut situation that chip control is difficult.
  • processing of a difficult-to-cut material generally uses a cutting insert 20 for drilling with a chip former 25 that is wider than a conventional insert, as shown in FIG. 2 , to improve chip control.
  • the chip former 25 since the chip former 25 has a larger width W2, the chip control performance for the chip C generated from the difficult-to-cut material can be improved.
  • an effective length D1 i.e., an effective chip control area
  • D2 shown in the indexable cutting insert of FIG. 2 has substantially the same size as W2, increasing W2 means that D2 becomes larger.
  • the chip former 25 a is disposed in parallel with a direction in which the chip enters, it cannot perform a chip control function.
  • the width of the chip former 25 increases, the chip control performance of the difficult-to-cut material is improved.
  • the width of a portion parallel to the direction in which the chip enters that is, a portion where chip control is not performed, also increases, the chip control performance is not improved as a whole or the degree of improvement is small due to a cancellation effect, which is problematic.
  • aspects of the present invention provide a cutting insert for drilling capable of eliminating the above-described side effects even if the width of a chip former is widened in order to improve the chip control performance.
  • aspects of the present invention also provide a drilling tool for mounting a plurality of cutting inserts for drilling in which the arrangement among the plurality of cutting inserts for drilling is optimized to improve the chip control performance that occurs in a drilling process.
  • a cutting insert for drilling comprising: an upper surface; a lower surface formed on an opposite side of the upper surface; a side surface connecting the upper surface and the lower surface; a cutting edge formed at an intersection of the upper surface and the side surface; and a ridge portion formed to protrude upward from the upper surface to facilitate chip control, wherein the ridge portion includes: a ridge body spaced apart from the cutting edge and disposed at a central portion of the cutting insert for drilling; and a ridge extension portion extending from a vicinity of a corner of the ridge body in a direction parallel to the cutting edge.
  • a drilling tool comprising: a drill body rotatable about a longitudinal axis; and at least one inner cutting insert and at least one outer cutting insert identical to the inner cutting insert and disposed outwardly in a radial direction, each of the inner cutting insert and the outer cutting insert, comprising: an upper surface; a lower surface formed on an opposite side of the upper surface;
  • the ridge portion includes: a ridge body spaced apart from the cutting edge and disposed at a central portion of the cutting insert; and a ridge extension portion extending from a vicinity of a corner of the ridge body in a direction parallel to the cutting edge.
  • an indexable cutting insert for drilling it is possible to increase the width of a chip former so as to be suitable for processing a difficult-to-cut material and minimize a reduction in an effective chip control area due to such an increase in the width of the chip former.
  • a drilling tool it is possible to optimize the arrangement among a plurality of cutting inserts for drilling mounted on the drilling tool to hide a non-use area in the cutting insert for drilling that interferes with effective chip control, thereby improving the drilling performance.
  • FIG. 1 is a plan view showing a general cutting insert for drilling according to the prior art.
  • FIG. 2 is a plan view showing a cutting insert for drilling in use for processing a difficult-to-cut material according to the prior art.
  • FIG. 3 is a plan view showing a shape of a ridge portion for chip control in a cutting insert for drilling according to an embodiment of the present invention.
  • FIG. 4 is a perspective view of a cutting insert for drilling according to an embodiment of the present invention.
  • FIG. 5 is a plan view of the cutting insert for drilling of FIG. 4 .
  • FIG. 6 is a side view of the cutting insert for drilling of FIG. 4 .
  • FIG. 7 is a bottom view of the cutting insert for drilling of FIG. 4 .
  • FIG. 8 is a cross-sectional view taken along line A-A′ in FIG. 5 .
  • FIG. 9 shows an overall shape of a drilling tool in which two cutting inserts for drilling are arranged.
  • FIG. 10 is an enlarged view of an end portion of the drilling tool of FIG. 9 in which the cutting inserts for drilling are arranged.
  • FIG. 11 shows a plan view of the axial end of the drilling tool along a longitudinal axis.
  • FIG. 12 is a view showing an inner cutting insert and an outer cutting insert, which overlap each other along the radius of rotation.
  • FIGS. 13 A to 13 C are views showing a cutting insert and a drilling tool according to a second embodiment of the present invention.
  • FIGS. 14 A to 14 C are views showing a cutting insert and a drilling tool according to a third embodiment of the present invention.
  • FIGS. 15 A to 15 C are views showing a cutting insert and a drilling tool according to a fourth embodiment of the present invention.
  • FIG. 3 is a plan view showing a shape of a ridge portion 114 for chip control in a cutting insert 100 for drilling according to an embodiment of the present invention.
  • the cutting insert 100 for drilling has a peripherally extending cutting edge 49 comprising a plurality of indexable cutting edges 50 .
  • the ridge portion 114 of the cutting insert 100 for drilling includes a ridge body 113 having a closed curve shape to surround a central bore 105 and a ridge extension portion 115 extending from the corner of the ridge portion 113 toward each of the cutting edges 50 .
  • the ridge extension portion 115 is asymmetric about an insert corner bisector B1 passing through the corner cutting edge and the center of the insert.
  • an effective chip control area is increased from D3, which is a conventional value, to D4 by adding the ridge extension portion 115 . Therefore, as the width of the ridge portion 114 becomes sufficiently large by providing the ridge extension portion 115 , the effective chip control area D4 can be sufficiently secured while facilitating chip control of a difficult-to-cut material. Thus, it is possible to eliminate side effects caused by an increase in the width W3 of the chip former. That is, a chip generated in the cutting edge 50 is allowed to climb over the extended ridge portion 113 , thereby expanding an area where chip control can be performed.
  • FIG. 4 is a perspective view of a cutting insert 100 for drilling according to an embodiment of the present invention.
  • FIG. 5 is a plan view of the cutting insert 100 for drilling
  • FIG. 6 is a side view of the cutting insert 100 for drilling
  • FIG. 7 is a bottom view of the cutting insert 100 for drilling
  • FIG. 8 is a cross-sectional view taken along line A-A′ in FIG. 5 .
  • the structure and function of the cutting insert 100 for drilling according to an embodiment of the present invention will be described with reference to FIGS. 4 to 8 .
  • the cutting insert 100 for drilling may be configured to include an upper surface 110 , a lower surface 150 formed on the opposite side of the upper surface 110 , a side surface 130 connecting the upper surface 110 and the lower surface 150 , the cutting edge 50 formed at an intersection of the upper surface 110 and the side surface, and the ridge portion 114 formed to protrude upward from the upper surface 110 to facilitate chip control.
  • a notch 116 serving as a reference marker in replacing a necessary cutting edge in the indexable cutting insert 100 for drilling is formed on one side of the ridge portion 114 .
  • the cutting edge 50 includes a major cutting edge 51 serving as a main part when cutting a workpiece, a minor cutting edge 52 serving as an auxiliary part during the cutting, and a corner cutting edge 53 connecting the both parts.
  • major cutting edges 51 a and 51 b are disposed adjacent to the drilling surface to perform a main cutting function
  • minor cutting edges 51 b and 52 b are disposed perpendicular to the drilling surface to perform an auxiliary cutting function.
  • An inclined surface 111 having a downward inclination from the cutting edge 50 toward the inside of the upper surface 110 is formed in order to impart a cutting angle to the cutting edge 50 .
  • the inner end of the inclined surface 111 is adjacent to a bottom surface 112 of the upper surface 110 .
  • the inclined surface 111 of the cutting edge 50 , the bottom surface 112 and an inclined surface 117 formed on the ridge portion 114 form a chip former which is recessed downward from the cutting edge 50 and the ridge portion 114 .
  • a chip former may be formed without the inclined surface 111 .
  • the ridge portion 114 includes the ridge body 113 having a closed curve shape when the upper surface 110 is viewed from the top, and the ridge extension portion 115 extending from the corner of the ridge body 113 toward the cutting edge 50 . It is preferable that the ridge extension portion 115 has the same height as the ridge body 113 . Specifically, the ridge extension portion 115 extends toward the minor cutting edge 52 in a direction perpendicular to the minor cutting edge 52 and parallel to the major cutting edge 51 .
  • the ridge extension portion 115 extends in a direction perpendicular to the minor cutting edge 52 and parallel to the major cutting edge 51 , when the chip generated by cutting by the major cutting edge 51 enters in a direction perpendicular to the major cutting edge 51 , appropriate chip control can be achieved by the ridge extension portion 115 .
  • the ridge extension portion 115 has a proximate edge 61 which borders a proximate inclined surface 62 .
  • the proximate edge 61 and the proximate inclined surface 62 face the major cutting edge 51 , are spaced apart therefrom by the chip former.
  • the proximate edge 61 and the proximate inclined surface 62 are parallel to the major cutting edge 51 and extend to a vicinity of the associated minor cutting edge 51 .
  • a gap space 55 is formed between the end of the ridge extension portion 115 and the minor cutting edge 52 . This gap space 55 prevents even a portion of the cutting edge 50 a from losing a cutting function.
  • the ridge extension portion 115 is formed to have a width W decreasing from the ridge body 113 toward the end 131 of the ridge extension portion 115 .
  • the width W is measured perpendicular to the major cutting edge 51 to which the ridge extension portion 115 is parallel.
  • the ridge portion 114 entirely has a shape in which the cross section of the ridge portion 114 increases from the upper side 122 of the ridge portion 114 to the upper surface 110 from which the ridge portion 114 protrudes so that the introduced chip can smoothly climb over the inclined surface 117 of the ridge portion 114 .
  • the ridge portion 114 has a shape which tapers in an upward direction from the upper surface 110 of the cutting insert to the upper side 122 of ridge portion 114 .
  • the ridge body 113 is configured to surround the bore 105 passing through from the upper surface 110 to the lower surface 150 .
  • the bore 105 is a component necessary for fixing to a pocket formed in a drill body by a screw.
  • a concave groove 135 is formed at the corner near the lower surface 150 of the cutting insert 100 for drilling to facilitate positioning when the cutting insert 100 for drilling is fixed to the pocket.
  • the edge of the bore 105 coincides with the inner closed curve of the ridge body 113 . That is, there are no bends or irregularities between the edge of the bore 105 and the ridge body 113 . Therefore, it is possible to simplify the structure of the cutting insert 100 for drilling and to secure a space of a sufficient size for the bore 105 in the upper surface 110 , and without having to separately form a downward inclined surface toward the inside of the ridge body 113 , the edge portion of the bore 105 itself can perform its role.
  • the chip control performance can be improved while sufficiently securing the widths of the chip formers 111 , 112 and 117 in a drilling process using the insert 100 .
  • the chip former has a groove or a groove shape, and it is necessary to satisfy a specific height condition between the cutting edge 50 , the bottom surface 112 , which is the bottom surface of the chip former, and the ridge portion 114 including the ridge body 113 and the ridge extension portion 115 .
  • the ridge body 113 and the ridge extension portion 115 has the same height a which is higher than the cutting edge 50 and the bottom surface 112 of the chip former, and the cutting edge 50 is higher than the bottom surface 112 of the groove. Therefore, a relationship “a>b>c” is established between the height a of the ridge portion 114 , the height b of the cutting edge 50 , and the height c of the bottom surface 112 of the chip former.
  • the chip generated from the workpiece in the vicinity of the cutting edge 50 in the drilling process is moved upward while sequentially passing through the chip former 112 and the ridge portion 114 , thereby achieving a preferable chip control.
  • FIG. 9 shows the overall shape of the drilling tool 60 in which two cutting inserts 100 for drilling are arranged.
  • FIG. 10 is an enlarged view of an end portion Z of the drilling tool 60 of FIG. 9 in which the cutting inserts 100 for drilling are arranged.
  • the drilling tool 60 includes a drill body 65 rotatable about a longitudinal axis R for drilling.
  • the drill body 65 has two receiving portions for receiving one cutting insert 100 for drilling in each case.
  • One of the two receiving portions serves as an inner receiving portion and the other receiving portion serves as an outer receiving portion.
  • the receiving portion has in particular a threaded bore for receiving a screw guided through the bore 105 in each cutting insert 100 for drilling in each case.
  • the receiving portion may have one or several contact surfaces in each case, so that the cutting insert 100 received therein can be supported in a form-fitting manner.
  • FIG. 11 shows a plan view of the axial end of the drilling tool 60 along the longitudinal axis R.
  • the first cutting insert 100 for drilling is fastened onto the drill body 65 as an inner cutting insert 100 a and the second cutting insert 100 for drilling which is the same as the first cutting insert 100 is fastened onto the drill body 65 as an outer cutting insert 100 b .
  • the inner cutting insert 100 a and the outer cutting insert 100 b are disposed in a first plane P1 substantially including the longitudinal axis R with different radial distances from the longitudinal axis R.
  • a second plane P2 including the longitudinal axis R extends perpendicularly to the first plane P1 and the inner cutting insert 100 a may be arranged such that its inner portion intersects the second plane P2.
  • the outer cutting insert 100 b is disposed slightly ahead of the first plane P1 with respect to rotation about the longitudinal axis R when the active cutting edge protruding beyond the drill body 65 in the axial direction extends at least substantially parallel to the first plane P1 and the drilling tool 60 is actuated.
  • the inner cutting insert 100 a and the outer cutting insert 100 b are arranged at different radial positions with respect to rotation about the longitudinal axis R when the drilling tool 60 is actuated, and are displaced about half a turn with respect to each other.
  • FIG. 12 is a view showing the inner cutting insert 100 a and the outer cutting insert 100 b arranged as shown in FIGS. 10 and 11 , which overlap each other along the radius of rotation.
  • the active cutting edge of the inner cutting insert 100 a and the active cutting edge of the outer cutting insert 100 b are combined to form a composite cutting edge L.
  • the active cutting edge means a cutting edge among indexable cutting edges 52 for drilling, which is currently installed and directly used for structural drilling
  • FIG. 12 shows the cutting edges provided below the inner and outer cutting inserts 100 a and 100 b , which form the composite cutting edge L.
  • the inner cutting insert 100 a is mounted on the drill body 65 such that a ridge extension portion 115 a formed in the inner cutting insert 100 a is adjacent to the longitudinal axis and has a direction parallel to the longitudinal axis.
  • the outer cutting insert 100 b is positioned such that a ridge extension portion 115 b formed in the outer cutting insert 100 b is overlapped and covered by the inner cutting insert 100 a.
  • the ridge extension portion 115 a perpendicular to the active cutting edge which may interfere with chip control or chip disposal in the inner cutting insert 100 a , is adjacent to the longitudinal axis R (rotational speed is close to 0), it is located in an area that does not affect cutting. Also, since the ridge extension portion 115 b perpendicular to the active cutting edge, which may interfere with chip control or chip disposal in the outer cutting insert 100 b , is covered by the inner cutting insert 100 a that leads the drilling process and is not substantially involved in cutting, no problem occurs either.
  • the drilling rotation speed becomes maximum at a major cutting edge 51 b farthest from the longitudinal axis R in the outer cutting insert 100 b . Therefore, the control of the chip formed by cutting at the furthest major cutting edge 51 b may be the biggest problem. This is because chip curling of the workpiece is not performed smoothly and the chip is elongated as the cutting speed is increased. This phenomenon is more conspicuous when the workpiece is made of soft mild steel.
  • a ridge extension portion 115 b ′ is formed corresponding to the major cutting edge 51 b , chip curling and chip cutting can be performed smoothly even at a position having a maximum rotation speed.
  • the composite cutting edge L more protrudes in the drilling direction (downward) at a portion (center portion of the composite cutting edge L) where the active cutting edge of the inner cutting insert 100 a and the active cutting edge of the outer cutting insert 100 b overlap each other than the vicinity of the longitudinal axis R and the outside of the active cutting edge of the outer cutting insert 100 b . Accordingly, the central portion of the composite cutting edge L serves as a tip in the drilling process.
  • FIGS. 13 A to 13 C are views showing a cutting insert and a drilling tool according to a second embodiment of the present invention.
  • FIG. 13 A is a plan view of a cutting insert 200 having a substantially parallelogram shape.
  • the cutting insert 200 also includes a ridge portion 214 formed to protrude upward from the upper surface, and the ridge portion 214 includes a ridge body 213 disposed at a central portion 205 of the cutting insert and spaced apart from the cutting edge 150 and a ridge extension portion 215 extending from the vicinity of the corner of the ridge body 213 in a direction parallel to the cutting edge 150 , in particular, the first cutting edge 151 .
  • the ridge body 213 and the ridge extension portion 215 preferably have the same height with respect to the upper surface.
  • a chip former 212 lower than the cutting edge 150 and the ridge extension portion 215 with respect to the upper surface is formed between the cutting edge 150 , particularly, the first cutting edge 151 and the ridge extension portion 215 extending parallel to the first cutting edge 151 , and the ridge extension portion 215 is formed to be higher than the cutting edge 150 with respect to the upper surface.
  • the cutting edge 150 includes a first cutting edge 151 and a second cutting edge 152 connected to the first cutting edge 151 at a corner cutting edge 153 .
  • the ridge extension portion 215 extends toward the second cutting edge 152 in a direction parallel to the first cutting edge 151 so that curling of the chip cut and discharged by the first cutting edge 151 can be smoothly performed.
  • FIG. 13 B is an enlarged view of an end portion of a drilling tool 160 in which the cutting insert 200 according to the second embodiment of the present invention is disposed.
  • FIG. 13 C is a view showing an inner cutting insert 200 a and an outer cutting insert 200 b which are overlapped along the radius of rotation in the drilling tool 160 of FIG. 13 B .
  • An active cutting edge 151 a of the inner cutting insert 200 a and an active cutting edge 152 b of the outer cutting insert 200 b are overlapped and combined to form a composite cutting edge.
  • the outer cutting insert 200 b is disposed such that at least a portion 152 b ′ of the active cutting edge 152 b of the outer cutting insert 200 b farthest from the longitudinal axis R is parallel to a ridge extension portion 215 b of the outer cutting insert 200 b.
  • the ridge extension portion 215 a formed in the inner cutting insert 200 a is adjacent to the longitudinal axis R and has a direction substantially parallel to the longitudinal axis R (i.e., the rotation speed is close to 0), it does not substantially affect the drilling process. Further, when the inner cutting insert 200 a and the outer cutting insert 200 b are overlapped in the rotation direction, a ridge extension portion (not shown) formed in the outer cutting insert 200 b in a direction substantially parallel to the longitudinal axis R is overlapped and covered by the inner cutting insert 200 a . Thus, the ridge extension portion, which may interfere with chip control in the outer cutting insert 200 b , is not involved in cutting during the drilling process.
  • FIGS. 14 A to 14 C are views showing a cutting insert and a drilling tool according to a third embodiment of the present invention.
  • FIG. 14 A is a plan view of a cutting insert 300 having a hexagonal shape.
  • the cutting insert 300 also includes a ridge portion 314 formed to protrude upward from the upper surface, and the ridge portion 314 includes a ridge body 313 spaced apart from the cutting edge 250 and disposed in a central portion 305 of the cutting insert and a ridge extension portion 315 extending from the vicinity of the corner of the ridge body 313 in a direction parallel to the cutting edge 250 , in particular, a first cutting edge 251 .
  • the ridge body 313 and the ridge extension portion 315 preferably have the same height with respect to the upper surface.
  • a chip former 312 lower than the cutting edge 250 and the ridge extension portion 315 with respect to the upper surface is formed between the cutting edge 250 , particularly, the first cutting edge 151 and the ridge extension portion 315 extending parallel to the first cutting edge 251 , and the ridge extension portion 315 is formed to be higher than the cutting edge 250 with respect to the upper surface.
  • the cutting edge 250 includes the first cutting edge 251 and a second cutting edge 252 connected to the first cutting edge 251 at a corner cutting edge 253 .
  • the ridge extension portion 315 extends toward the second cutting edge 252 in a direction parallel to the first cutting edge 251 so that curling of the chip cut and discharged by the first cutting edge 251 can be smoothly performed.
  • FIG. 14 B is an enlarged view of an end portion of a drilling tool 260 in which the cutting insert 300 according to the third embodiment of the present invention is disposed.
  • FIG. 14 C is a view showing an inner cutting insert 300 a and an outer cutting insert 300 b which are overlapped along the radius of rotation in the drilling tool 260 of FIG. 14 B .
  • An active cutting edge 251 a of the inner cutting insert 300 a and an active cutting edge 251 b of the outer cutting insert 300 b are overlapped and combined to form a composite cutting edge.
  • the outer cutting insert 300 b is disposed such that at least a portion 251 b ′ of the active cutting edge 251 b of the outer cutting insert 300 b farthest from the longitudinal axis R is parallel to a ridge extension portion 315 b of the outer cutting insert 300 b.
  • a ridge extension portion 315 a formed in the inner cutting insert 300 a is adjacent to the longitudinal axis R and has a rotation speed which is close to 0, it does not substantially affect the drilling process. Further, when the inner cutting insert 300 a and the outer cutting insert 300 b are overlapped in the rotation direction, a ridge extension portion (not shown) arranged in a direction unsuitable for chip control in the outer cutting insert 300 b is overlapped and covered by the inner cutting insert 300 a . Thus, the ridge extension portion, which may interfere with chip control in the outer cutting insert 300 b , is not involved in cutting during the drilling process.
  • FIGS. 15 A to 15 C are views showing a cutting insert and a drilling tool according to a fourth embodiment of the present invention.
  • FIG. 15 A is a plan view of a cutting insert 400 having a substantially equilateral triangular shape.
  • the cutting insert 400 also includes a ridge portion 414 formed to protrude upward from the upper surface, and the ridge portion 414 includes a ridge body 413 spaced apart from a cutting edge 350 and disposed in a central portion 405 of the cutting insert and a ridge extension portion 415 extending from the vicinity of the corner of the ridge body 413 in a direction parallel to the cutting edge 350 , in particular, a first cutting edge 351 .
  • the ridge body 413 and the ridge extension portion 415 preferably have the same height with respect to the upper surface.
  • a chip former 412 lower than the cutting edge 350 and the ridge extension portion 415 with respect to the upper surface is formed between the cutting edge 350 , particularly, the first cutting edge 351 and the ridge extension portion 415 extending parallel to the first cutting edge 351 , and the ridge extension portion 415 is formed to be higher than the cutting edge 350 with respect to the upper surface.
  • the cutting edge 350 includes the first cutting edge 351 and a second cutting edge 352 connected to the first cutting edge 351 at a corner cutting edge 353 .
  • the ridge extension portion 415 extends toward the second cutting edge 352 in a direction parallel to the first cutting edge 351 so that curling of the chip cut and discharged by the first cutting edge 351 can be smoothly performed.
  • FIG. 15 B is an enlarged view of an end portion of a drilling tool 360 in which the cutting insert 400 according to the fourth embodiment of the present invention is disposed.
  • FIG. 15 C is a view showing an inner cutting insert 400 a and an outer cutting insert 400 b which are overlapped along the radius of rotation in the drilling tool 360 of FIG. 15 B .
  • An active cutting edge 351 a of the inner cutting insert 400 a and an active cutting edge 351 b of the outer cutting insert 400 b are overlapped and combined to form a composite cutting edge.
  • the outer cutting insert 400 b is disposed such that at least a portion 351 b ′ of the active cutting edge 351 b of the outer cutting insert 400 b farthest from the longitudinal axis R is parallel to a ridge extension portion 415 b of the outer cutting insert 400 b.
  • a ridge extension portion 415 a formed in the inner cutting insert 400 a is adjacent to the longitudinal axis R and has a rotation speed which is close to 0, it does not substantially affect the drilling process. Further, when the inner cutting insert 400 a and the outer cutting insert 400 b are overlapped in the rotation direction, a ridge extension portion (not shown) arranged in a direction unsuitable for chip control in the outer cutting insert 400 b is overlapped and covered by the inner cutting insert 400 a . Thus, the ridge extension portion, which may interfere with chip control in the outer cutting insert 400 b , is not involved in cutting during the drilling process.
US16/632,558 2017-08-23 2018-07-04 Cutting insert for drilling Active 2039-04-09 US11759869B2 (en)

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PCT/KR2018/007546 WO2019039724A1 (en) 2017-08-23 2018-07-04 CUTTING INSERT FOR DRILLING

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7321411B2 (ja) * 2019-03-06 2023-08-07 Ｎｔｋカッティングツールズ株式会社 切削チップ及び被加工部材の製造方法
CN112077370A (zh) * 2019-06-13 2020-12-15 肯纳金属印度有限公司 可转位钻头刀片
CN112077369A (zh) 2019-06-13 2020-12-15 肯纳金属印度有限公司 可转位钻头刀片
US10974328B2 (en) 2019-06-25 2021-04-13 Iscar, Ltd. Indexable drilling insert having three tip portions and rotary cutting tool having such drilling insert centrally mounted
CN112388033A (zh) 2019-08-14 2021-02-23 肯纳金属印度有限公司 可转位钻头刀片
KR102551397B1 (ko) * 2022-12-23 2023-07-04 주식회사 와이지-원 절삭인서트 및 이를 포함하는 드릴공구

Citations (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3786541A (en) * 1971-10-27 1974-01-22 Sandvikens Jernverks Ab Cutting inserts having two-stage chipbreaker
US4411565A (en) * 1981-05-08 1983-10-25 General Electric Company Finishing insert with improved chip control
JPS6134611A (ja) * 1984-07-27 1986-02-18 Toshiba Corp トレイサブル走行シミユレ−タ
US4776732A (en) * 1982-02-26 1988-10-11 Carboloy Inc. Drill with disposable inserts
US5007775A (en) * 1988-09-06 1991-04-16 Sandvik Ab Cutting insert for chip removing machining
US5122017A (en) * 1991-02-19 1992-06-16 Kennametal Inc. Cutting insert with chip control
JPH06134611A (ja) * 1992-10-26 1994-05-17 Mitsubishi Materials Corp スローアウェイチップおよびスローアウェイ式穴明け工具
US5791833A (en) * 1994-12-29 1998-08-11 Kennametal Inc. Cutting insert having a chipbreaker for thin chips
US5803674A (en) 1994-10-23 1998-09-08 Iscar, Ltd. Exchangeable cutting insert
US6039515A (en) * 1997-04-30 2000-03-21 Seco Tools Ab Drill having radially overlapping indexable cutting inserts
JP2000107920A (ja) * 1998-09-30 2000-04-18 Kyocera Corp ドリルインサート及びこれを用いたスローアウェイドリル
US6079912A (en) * 1996-01-31 2000-06-27 Widia Gmbh Cutter insert for roughing and finishing
US6224300B1 (en) * 1997-05-13 2001-05-01 Komet Praezisionswerkzeuge Robert Breuning Gmbh Cutting insert for shaping by chipping
US20020146293A1 (en) 2001-04-04 2002-10-10 Nelson Joseph V. Cutting insert having improved cutting
US20030223833A1 (en) 2002-05-29 2003-12-04 Sandvik Ab Drilling tool set, drilling tool and indexable drill bit therefor
US6935815B2 (en) * 2000-08-18 2005-08-30 Widia Gmbh Cutting insert
US20050254908A1 (en) * 2002-06-26 2005-11-17 Jane Doe Double-sided indexable cutting insert and method of manufacture
JP2006075913A (ja) * 2004-09-07 2006-03-23 Mitsubishi Materials Corp インサートおよびスローアウェイ式切削工具
US20070201962A1 (en) * 2006-01-30 2007-08-30 Sandvik Intellectual Property Ab Drill and drill a cutting insert
US20080181737A1 (en) * 2007-01-29 2008-07-31 Sandvik Intellectual Property Ab Indexable insert drill and a center insert therefore
US20080219791A1 (en) 2007-03-07 2008-09-11 Sumitomo Electric Hardmetal Corp. Indexable insert and drill using the same
US20090060665A1 (en) * 2007-08-31 2009-03-05 Sandvik Intellectual Property Ab Cutting insert for chip removing machining of workpieces
KR20100055971A (ko) 2008-11-18 2010-05-27 대구텍 유한회사 드릴용 절삭공구
US20100272526A1 (en) * 2009-04-28 2010-10-28 Tdy Industries, Inc. Double-sided cutting insert for drilling tool
US20100329804A1 (en) * 2008-02-27 2010-12-30 Kyocera Corporation Cutting Insert for Drill, Drill, and Method of Cutting Using the Same
US7891916B2 (en) 2008-03-31 2011-02-22 Mitsubishi Materials Corporation Insert for drill and indexable insert drill
US20110044776A1 (en) * 2008-05-23 2011-02-24 Kyocera Corporation Drill, Cutting Insert, and Method of Manufacturing Cut Product
US8157489B2 (en) * 2006-09-25 2012-04-17 Sandvik Intellectual Property Ab Tool for chip removing machining and a cutting insert therefor
JP2012143866A (ja) 2012-03-29 2012-08-02 Taegutec Ltd ドリル工具用ドリル本体
US20130251468A1 (en) 2011-09-23 2013-09-26 Ronnie Lof Polygonal Turning Insert
US20140161552A1 (en) 2011-07-22 2014-06-12 Kennametal India Limited Indexable drill insert
US20140212235A1 (en) 2011-07-05 2014-07-31 Ceratizit Austria Gesellschaft M.B.H. Drill cutting insert
US20150023744A1 (en) * 2013-07-22 2015-01-22 Kennametal Inc. Cutting insert with chip dividers
US20150165532A1 (en) 2012-05-30 2015-06-18 Kyocera Corporation Cutting insert, cutting tool, and method of producing machined product
WO2015098646A1 (ja) * 2013-12-26 2015-07-02 三菱マテリアル株式会社 ドリル用インサートおよび刃先交換式ドリル
US20150246398A1 (en) * 2012-09-20 2015-09-03 Tungaloy Corporation Cutting insert and cutting edge replaceable rotary cutting tool
US20160023282A1 (en) * 2014-07-25 2016-01-28 Kennametal India Limited Indexable inserts and drills comprising the same
US20160107248A1 (en) * 2013-05-21 2016-04-21 Pramet Tools, S.R.O. Indexable milling insert having side supporting valley, and a milling tool
US20170120342A1 (en) 2014-03-27 2017-05-04 Kyocera Corporation Cutting insert, cutting tool, and method for manufacturing machined product

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4239236C2 (de) * 1992-11-21 1997-06-26 Widia Gmbh Schneideinsatz
JP4384327B2 (ja) 2000-03-07 2009-12-16 京セラ株式会社 ドリルインサート
JP2003099494A (ja) 2001-09-25 2003-04-04 Hitachi Ltd バイパスコンデンサ部品配置システム
AT6618U1 (de) 2002-08-16 2004-01-26 Plansee Tizit Ag Schneidwerkzeug zum drehen und bohren ins volle
US8579556B2 (en) 2007-01-31 2013-11-12 Kyocera Corporation Insert for drill, drill and method of cutting work material

Patent Citations (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3786541A (en) * 1971-10-27 1974-01-22 Sandvikens Jernverks Ab Cutting inserts having two-stage chipbreaker
US4411565A (en) * 1981-05-08 1983-10-25 General Electric Company Finishing insert with improved chip control
US4776732A (en) * 1982-02-26 1988-10-11 Carboloy Inc. Drill with disposable inserts
JPS6134611A (ja) * 1984-07-27 1986-02-18 Toshiba Corp トレイサブル走行シミユレ−タ
US5007775A (en) * 1988-09-06 1991-04-16 Sandvik Ab Cutting insert for chip removing machining
US5122017A (en) * 1991-02-19 1992-06-16 Kennametal Inc. Cutting insert with chip control
JPH06134611A (ja) * 1992-10-26 1994-05-17 Mitsubishi Materials Corp スローアウェイチップおよびスローアウェイ式穴明け工具
US5803674A (en) 1994-10-23 1998-09-08 Iscar, Ltd. Exchangeable cutting insert
US5791833A (en) * 1994-12-29 1998-08-11 Kennametal Inc. Cutting insert having a chipbreaker for thin chips
US6079912A (en) * 1996-01-31 2000-06-27 Widia Gmbh Cutter insert for roughing and finishing
US6039515A (en) * 1997-04-30 2000-03-21 Seco Tools Ab Drill having radially overlapping indexable cutting inserts
US6224300B1 (en) * 1997-05-13 2001-05-01 Komet Praezisionswerkzeuge Robert Breuning Gmbh Cutting insert for shaping by chipping
JP2000107920A (ja) * 1998-09-30 2000-04-18 Kyocera Corp ドリルインサート及びこれを用いたスローアウェイドリル
US6935815B2 (en) * 2000-08-18 2005-08-30 Widia Gmbh Cutting insert
US20020146293A1 (en) 2001-04-04 2002-10-10 Nelson Joseph V. Cutting insert having improved cutting
US6530726B2 (en) * 2001-04-04 2003-03-11 Kennametal Inc. Cutting insert having improved cutting
US20030223833A1 (en) 2002-05-29 2003-12-04 Sandvik Ab Drilling tool set, drilling tool and indexable drill bit therefor
US20050254908A1 (en) * 2002-06-26 2005-11-17 Jane Doe Double-sided indexable cutting insert and method of manufacture
JP2006075913A (ja) * 2004-09-07 2006-03-23 Mitsubishi Materials Corp インサートおよびスローアウェイ式切削工具
US20070201962A1 (en) * 2006-01-30 2007-08-30 Sandvik Intellectual Property Ab Drill and drill a cutting insert
US8157489B2 (en) * 2006-09-25 2012-04-17 Sandvik Intellectual Property Ab Tool for chip removing machining and a cutting insert therefor
US20080181737A1 (en) * 2007-01-29 2008-07-31 Sandvik Intellectual Property Ab Indexable insert drill and a center insert therefore
US8192113B2 (en) * 2007-01-29 2012-06-05 Sandvik Intellectual Property Ab Indexable insert drill and a center insert therefore
US20080219791A1 (en) 2007-03-07 2008-09-11 Sumitomo Electric Hardmetal Corp. Indexable insert and drill using the same
US8197163B2 (en) * 2007-03-07 2012-06-12 Sumitomo Electric Industries, Ltd. Indexable insert and drill using the same
US20090060665A1 (en) * 2007-08-31 2009-03-05 Sandvik Intellectual Property Ab Cutting insert for chip removing machining of workpieces
US20100329804A1 (en) * 2008-02-27 2010-12-30 Kyocera Corporation Cutting Insert for Drill, Drill, and Method of Cutting Using the Same
US7891916B2 (en) 2008-03-31 2011-02-22 Mitsubishi Materials Corporation Insert for drill and indexable insert drill
US20110044776A1 (en) * 2008-05-23 2011-02-24 Kyocera Corporation Drill, Cutting Insert, and Method of Manufacturing Cut Product
KR20100055971A (ko) 2008-11-18 2010-05-27 대구텍 유한회사 드릴용 절삭공구
US20100272526A1 (en) * 2009-04-28 2010-10-28 Tdy Industries, Inc. Double-sided cutting insert for drilling tool
US20140212235A1 (en) 2011-07-05 2014-07-31 Ceratizit Austria Gesellschaft M.B.H. Drill cutting insert
US20140161552A1 (en) 2011-07-22 2014-06-12 Kennametal India Limited Indexable drill insert
US20130251468A1 (en) 2011-09-23 2013-09-26 Ronnie Lof Polygonal Turning Insert
JP2012143866A (ja) 2012-03-29 2012-08-02 Taegutec Ltd ドリル工具用ドリル本体
US20150165532A1 (en) 2012-05-30 2015-06-18 Kyocera Corporation Cutting insert, cutting tool, and method of producing machined product
US20150246398A1 (en) * 2012-09-20 2015-09-03 Tungaloy Corporation Cutting insert and cutting edge replaceable rotary cutting tool
US10029317B2 (en) 2012-09-20 2018-07-24 Tungaloy Corporation Cutting insert and cutting edge replaceable rotary cutting tool
US20160107248A1 (en) * 2013-05-21 2016-04-21 Pramet Tools, S.R.O. Indexable milling insert having side supporting valley, and a milling tool
US20150023744A1 (en) * 2013-07-22 2015-01-22 Kennametal Inc. Cutting insert with chip dividers
WO2015098646A1 (ja) * 2013-12-26 2015-07-02 三菱マテリアル株式会社 ドリル用インサートおよび刃先交換式ドリル
US20170120342A1 (en) 2014-03-27 2017-05-04 Kyocera Corporation Cutting insert, cutting tool, and method for manufacturing machined product
US20160023282A1 (en) * 2014-07-25 2016-01-28 Kennametal India Limited Indexable inserts and drills comprising the same

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
Extended European Search Report dated Apr. 13, 2021, in EP counterpart application No. 18848363.0.
International Search Report dated Oct. 12, 2018, issued in counterpart International (PCT) Application (No. PCT/KR2018/007546).
Notice of Allowance dated Apr. 9, 2022, in Korean counterpart application No. 10-2017-0106510, with English translation.
Office Action dated Apr. 5, 2022, in Japanese counterpart application No. 2020-511167, with English translation.
Office Action dated Nov. 3, 2020, issued in counter-part Chinese application (No. 201880054551.2).
Written Opinion dated Oct. 12, 2018, issued in counterpart International (PCT) Application (No. PCT/KR2018/007546).

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JP7168657B2 (ja) 2022-11-09
CN111093872A (zh) 2020-05-01
WO2019039724A1 (en) 2019-02-28
CN111093872B (zh) 2021-12-28
JP2020531296A (ja) 2020-11-05
US20200238397A1 (en) 2020-07-30
KR20190021592A (ko) 2019-03-06
EP3672752A1 (en) 2020-07-01
KR102386942B1 (ko) 2022-04-14
EP3672752A4 (en) 2021-05-19

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